I think, this feature doesn't behave as it should, and i suppose it's an easy fix.
In my pov, this option should invert the expand state of a tree node.
I mean when i clic:
* on a colapsed folder in the tree, it should expand it, showing all sub-folder.
* on an expanded folder in the tree, it should collapse it (it does) and not expand it just after !
Version 1.4.0.1683 64bit.
Previous version does the same, i haven't try to go back to 1.3.5 or previous build.